Optical converter for high luminances
AssigneeSchott AG
InventorsVolker Hagemann, Peter Nass, Yvonne Menke, Bernd Hoppe, Wolfram Beier, Rainer Liebald, Niko Schultz, Guenter Weidmann, Hauke Esemann
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Abstract
An optical converter for producing colored or white light from blue excitation light is provided. The converter has good scattering properties to be able to produce nearly white light from the scattered blue light components and the scattered, converted yellow light components. The optical converter includes material including one or more of a YAG ceramic, a LuAG ceramic, and a magnesium-aluminum ceramic exhibiting strong scattering.
Claims24
A converter for producing colored or white light from blue excitation light, comprising:
- a converter body having an excitation face and an opposite face, the spacing therebetween defining the thickness of the converter body, the converter body comprising a cerium doped optoceramic converter material selected from the group consisting of a YAG ceramic, a LuAG ceramic, and a magnesium-aluminum ceramic, wherein the optoceramic converter material has a degree of cerium doping and is sintered at a temperature that are sufficient to provide an embedded grain structure in the doped optoceramic material which exhibits scattering to obtain an emission spot of a common size as a cross section of a light beam of the excitation light, to obtain a remission factor of longer wavelength light of 600 nm wavelength of Remission>0.6, and to obtain a quantum efficiency QE of greater than 0.80.
A converter for producing colored or white light from blue excitation light, comprising:
- a converter body having an excitation face and an opposite face, the spacing therebetween defining the thickness of the converter body, wherein the converter material comprises a cerium doped optoceramic having a degree of cerium doping and being sintered at a temperature that are sufficient to provide an embedded grain structure in the doped optoceramic which exhibits scattering to obtain an emission spot of a common size as the cross section of the light beam of the excitation light, to obtain a remission factor of longer wavelength light of 600 nm wavelength of Remission>0.6, and to obtain a quantum efficiency QE of greater than 0.80, wherein the converter material is a doped YAG ceramic or LuAG ceramic.
A converter comprising a ceramic converter material having a cerium doped optoceramic that has a degree of cerium doping and is sintered at a temperature that are sufficient to provide an embedded grain structure in the doped optoceramic so that the ceramic converter material exhibits an optical figure of merit of FOMopt=QE*Remission that is greater than 0.5, wherein the QE is a quantum efficiency and the Remission is a remission factor of longer wavelength light of 600 nm wavelength.
Dependencies are inferred from the claim text.